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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb9d68f27c760363d734760b12f692c31f707b1c712304c5247f48e3f8b1e05' 
  AND token = 'lSSRaxc4NVSOt3qzijAgD9Mc48WhPHnD3BF7V32gzpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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