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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be6d97cefdc54864beb4080364126dc45008554f1c47aa5de0c95dde59d2cca' 
  AND token = 'mZQ576AJrJaoAwTiHq9qEJYjKONS3M624fsRL4kBLaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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