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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e6e826ac70688ace8b49025dedbf82228ec748701bfccafd2d24381a6c074b' 
  AND token = '/WpF/ew9Wy3jK8I7GX6/3pEZMpfPRSTdnnp+uKILee8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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