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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c443a756a35702ec05f9fbbce2bb196485616cade50fb84d6190442ddc67cdf' 
  AND token = '9fAOkddTrhczqit6tkWcm6R3qKxAZAGq5qW4rVY2EQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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