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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcb25d838382f336260a782afd6d805eb1575770a42ec6369bf3ef64f188e02' 
  AND token = 'h77ITkIAx8UfRPvekJVCLEyNbd8zneQ7wHfYzVM5R9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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