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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0651dffcf0665fb67f33db7a05d7eabc24f25667644ae6e29ed8c7768f9c83f9' 
  AND token = 'gjGdXLHltIMEBS1Q81dp9kbjSrIKF6OXrrLPF/PQESU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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