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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08614701021de1ba5c914628c6ec942685f5cf36634f423c9e736b7b1670e315' 
  AND token = 'NAMKpxjhW0+NGupWfvSvENAffxUg26YC2F+xK6fGgYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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