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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac71c9c736ece4b5e363214592d20aeb5a90466dd647d5c9541ba8c580932bc' 
  AND token = 'dcsw9R29ckqdFO/4XudiOvMk5G9cuSJ9rCEJxPRMJCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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