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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0da0407dbd5abe1a0b076197ca3cf907e60b1b665df8713fbd96876511271b0' 
  AND token = '3unCJCGxEHlFc3bEf7/Xy9cQIFV6ITdMFNk1Phaw+d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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