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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658b5b4ec2acc6003b72c746c432c61347ab43e6abb4ec4107d8ffb0eee60189' 
  AND token = '9tnKU4WcwO8XgEmXMThU9aRGdIxU5rvk943bHWnednk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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