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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1b3e96b7fdf17bef5eb48948c93e87db6070253eb2edefa2520161a4f136e0' 
  AND token = '1Tm+lduE2EvP1Vcdpbk9J9VqkZYIF6VNo/yBhWsaB6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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