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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e7e14ab47b7b6384d7366376ee249b30fcbcce8e429f833630490c602e8dcd' 
  AND token = '/tBbhm7A0q3ljpmmU2sFdcJpMJ+ivCenLZ+iPkQx+fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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