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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80617981ff0d90c36c2a9bb12cade74222770e0b798071887da7a0be81a3e231' 
  AND token = 'YgGjIxPpvcYl3DU6gkEOuTEKCE7RRko8IRIJNpTyD+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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