SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b9f7bc580287b9f347209d485ed61b05b7f8618722beef9c2731596c22c16c' 
  AND token = 'R6VLLZlkSMcmarwGrIyZx4qXGwfJd/a0RTlpIA3szCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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