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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a20bbe1b1a7c6d2491d4f2788cbf9dc2f775ab9682bc943ea7afd36b1be51b3' 
  AND token = 'E0fiSxg3zpKW4y5Es1GvLrTe/Gowb/xUfspATqJGoSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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