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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1247da2500766aba300651eed3b33eda9d702cb843e596c291567d25eaab268a' 
  AND token = 'Fkl1xog2XjmiDTGK6R89i9T29WQ04PzgLERQpl0er6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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