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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e480ec99f8977806c0e5779720e0179cba9181c8f4455d67d99c394383402c31' 
  AND token = 'LibVc8ApDlH14KD8nM2icXH5uWbuMCT+SWQT7oEFTX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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