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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1a709ae36483da524c33a5218a6de80231d39c058ccb33332b370d6c4a2535' 
  AND token = 'GJVFmVRBYoJAR3BTJL3IDKBnl8Y/4rwjffr4+3P4KNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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