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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697d7d35a085527a16d0d30481efd82e42493603d087940b6aea6aaa21b09a18' 
  AND token = 'xbecH8DtnqTrK2e/xKsrNpgh9esjRBxRlZrMz0ALZVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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