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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea8e37ee32f703b02c3ce82bece2f8089c30b72d47ded2772c39f69f6b5f7fe' 
  AND token = 'bmQZjA6hT7fE+X6IsX3sk9PFcclftOd1sB7huiWGtxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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