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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708f9b122781854ea8c07d4acce9fca40f3cb71a6842d26a2d7ed4faf86f52b4' 
  AND token = 'cc0sp6pq2DdHrzTRipDIx+F3fJw30Q5jE3OZWc3/qug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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