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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d31af975e9baec5e6dc568e91e33e917c55fa1adaf1b2a2334f7d62f747bc1' 
  AND token = '8bNIlPA+Gy1ZanbDzUflmanfHJE5Sj6q0o8ymBTrdfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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