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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e702680a0c06c8ded3946dc73f528c09837e1153c2369fbbde6c5440c038988' 
  AND token = 'MgIt4mt2gaqnQctbS+TPxLS+Py0s5/1ErlQtdjXouiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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