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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab02a44f14ae9db8bb709e995f7646568ae879e0f066297b6a7a5ad74f939e8' 
  AND token = 'kWf85jIstD/zYllw5j9AianKF3FkyI5Uzts6oYH7KLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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