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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5f1f4ad67ff6b32a9078894f5708d1bc9e15d59fd43708b694c253d54c15bf' 
  AND token = 'Hn4qmdXYU7Ise4ZGCR/Ch/qPS9JDT5oJ2w9I873d3SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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