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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31ea40610940467fa168fe13aa9fc5fda071566a1decc99b8c4d483f1c3f7ce' 
  AND token = 'lWc49cFVwiro9y1T+wmYO+R3QNAflk05sGCQbAUiSNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}