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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb35fb45ee628995e0ed4fd6f7ff525f4d2d8a45336f9d5216a9a307309cf9f' 
  AND token = 'NB4KYpUlqAGf0fYWEn5tL3bwR4gz4hwmHqeEzeMIBls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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