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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8209a0efe0349638a49668cf4e340a669a81844e0a911255861a1965220d7771' 
  AND token = 'KHFlftUHma6NWSL+OL8MqbGGl1ukbsIyD24rhPGnGxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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