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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1e613428a179936ca2050b355e25e07db0ded90ba9038f26a975ef847fd130' 
  AND token = 'IwF4V91umDlCunbWRUkDbOtM5bi5stbx5Jx/ZggZRXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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