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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2557e35089e701043bffdaad9e117e6e136ddcb1bc76395d7a7606ab883e5bc6' 
  AND token = 'vTX6kuUsnX/NwNwY5oVI/Ty6uaIxq9eysna9LL4ndjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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