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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23aafb497d6db9a792631dc691346c13b25ac269dc70509e6c8253580a558e7c' 
  AND token = '4mgprQZeWkr3okN4WChHW9dqv+d4Bmphojt6APlh6TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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