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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c62dbdb06586104b221dd1ca478f0581a1c0efbf5254eb3a40b0ccb53a5e3fc' 
  AND token = 'XGvpKtISN/5QvrLdFDQCjIJPqUZ1qmCM5F8vcVXDS4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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