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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f46b49feddcec5903411dfa33b1f90d2813de36a0a6746128bb708c322bbf6a' 
  AND token = '70D4960gtnsMe3O2iE55JownhemURP2U8mS55s879qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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