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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b32368b5a7bb6ec0b88e769ad6c2ff3eb505a1bc12971ba0de5bec92fe911f' 
  AND token = 'xVgm79f31VJXdFX7MxVVMqB5fJg/oFueVENdW52d3Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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