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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7283d237927c1db40743118455d2a365845a7a7b8ea9ef9616db3e84df9837' 
  AND token = 'ruLJI6Va1Ltfg7U9JdU7aYg9pjbceVJyAxHy8cOf8oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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