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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee12d30667ad24446f731293a0bbce07a73c6b601a8d6a8feeaa7b56fa7be1c' 
  AND token = 'Q7u7a9LrtqGiw0dkDcWuPzLLFvrUTlscdX+rFFuiiOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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