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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be2969c8efd715c6d8a61a7ec0882836a70a8f3680775e3dff0d887767d9a27' 
  AND token = 'CypGZX7N4yEykJEkEm+gQuZShcmImo+vUKUpdBwBd+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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