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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacf582c7c671c4556a3554a3e6839f4a2a65257181784a3a46718f39b87974c' 
  AND token = 'MRiC4vVb6IMj0uUbXBrDyoglo5iUR6EIBa4M6RrGB4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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