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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c388bb93418c60b9e01661dff02cc5659f94bf95f17e49e4552017dab9f14e6' 
  AND token = 'xkg+2o9h1PFsduDUqNRvJcEQWX+7qPL8QI7FwyPVk6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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