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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd334115c0d4a39f9a55ff3dd2261700921e4b18834bc5c9f54f613741fe4b6' 
  AND token = 'j68kllsQWx5lffFkqGWaziXzEo3g+T0tKlU8tnHcmnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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