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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17759626f4d86c7326ebb3512e636ede3e0ba1e15039dabcfd54a4e6e21a79e' 
  AND token = 'tp3SUdyDf3NSX910/+ezh5igUzLt8g4Qu4dgnhNG7BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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