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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f13752d1c9e0996b57fe1e451a4e15968dc61cfec7bf6642e3b090bebc398ef' 
  AND token = '++wjwJRu2zd030mLlZV4tHm+ms2eXtAkzzn6xKvETDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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