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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a4c0a6f3a92c7bf937e91bd65f07332071a44ff69e239ba7b5a3b91ae37ec0' 
  AND token = 'bM23xMzY3n0Lx4APRf/6l5uHT5VGe1TcXcvlYJypWdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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