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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a79ae730189d764eb9cf74c4c852556fbf577c98d825342942a86b1727a64f' 
  AND token = '+7g+waCQNi9vs1y4m5x0xsmMtGU+06GsecmgCBFbYBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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