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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc75dc889313c5b2e048b18c2b724d071fbb2510e2b0b930d55b30a00e7ea308' 
  AND token = 'met+F3nxR9HxI/uvl+DFKL8st7msggBTzVwQiWhvELE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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