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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83218a36137061b3e37ee9915b86c241137005c600d6e0d06a0d45aa447d8698' 
  AND token = 'lu01/dGx0g1NbictoJSfjg8JC+BNEBWcX/8I7lDHoQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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