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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910920559f74a99fcdffde84344c6f45beb97a18ca58a8ac0966888917a6b4df' 
  AND token = 'hsLxyMuZ1s2poZ5TcupzXEk7l8rGVWMd63gZgUXQJ0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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