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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f420f7740a681b4dcf9a5f7078d0d474f0f035c10c89cce44054e5ea57435e19' 
  AND token = '8VUHXmqFQM9aHaptvd/SExHY8hNEaiIyO/nF657aBf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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