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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc47176864cd5b2d9b5df81d85cd286fc9f79e5b1523a7480a594e0823d65e96' 
  AND token = 'MV6PIxxYCm2Nx5rjEtTp+GcvknjDBxXU+IxlnUkpl18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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