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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f960cbea3d803554df0d796f8ac1d9fd4d8c309559ffa916115a285b93da05b' 
  AND token = 'ord9YHmCB28n0oCJkfYrrjugV9zjuWNHj6fEJ10D67w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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