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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b369dbb243b6898d6d6407e0064e7dcddf1273e30a68d37796cafc368a9646a' 
  AND token = 'MEPwo+Kf4YFcPG5Er8T7K9PJJ4/WPx/qMK3brTHo5j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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