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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba03518baadf198039ea5348e80133609fcb66abb56a0a64a55c93f10162e81d' 
  AND token = 'Uq0/8EWt3KI4IP2N6qA7agRsT9I2bqcXPxL7Dcz9HKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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