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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a1a31bad4b039c65d505990acb0e3626f8d64292d5a3e54c966a46f682b374' 
  AND token = 'UaBe437w5rrDBYQ0QMMm83Qy1p3U/cZjHbLkHdCACBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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