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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d130965c79990ce1b95c0daf1e5019ebf114ec4d299b33d61a9f84f821aadd' 
  AND token = 'RlYAsKX55y2IK5qF6whUXzKVNKekFvhz8a5enHKNg0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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