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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e058e83fafb5aa6dfd056ce5aaecadfd062ac2598357f6c8abd7979b03a36112' 
  AND token = 'AIN4jsEQ2PQr6o2p7Py/cyuu+7nXbENhytiBGeKre6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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