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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd955771dac48eaaf2d94cac3a0ddbf5de0ddfbc4d3d9d3b8ba6607897c3533f2' 
  AND token = 'c+0aohl+QRTn7LDMXUFJCbnARXK10MU2561QlCcWnSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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