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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7959784cdf47abdec8191bb0581f82f6db76e92f5e55fe69e0357b7446446a' 
  AND token = 'WqPKAAwXELFjGeaJT7yreAM7OecLPx8OCrsZkssxE4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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