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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a77502a2344fc922276336a258b8d7905cce68ce472d073049384fbb0031dc' 
  AND token = 'IAzkK6b0p00TARpqgGeMe7MddHGxqz+nJ/Lollpm0yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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