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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856ae698189291c0c1a810877121dfe09e1ff3591c4fcf43b33f70464334ca40' 
  AND token = 'XFZI7O3JUvSvwDz9of7sP0ayS83gd/F0Q4enp/A1sbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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