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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54277e40faa24eb6460b5f85c3ae24c8dce1ff73c20435bc515d56b9905816c' 
  AND token = 'KyvJWtisYuvM/1QFdXcBs07rfInwmbAXK6rVf8BalKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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